public class E3 {
   public static void main (String args[ ]) {
     long[] a = {1,2,3,4};
     long[] b = {100,200,300,400,500};
     b = a;
     System.out.println("数组b的长度:"+b.length);
     System.out.println("b[0]="+b[0]);
   }
}
